It requires strong steel and robust machinery to process the kind of sludge that SPI/Mobile Pulley Works (formerly Steel Processors) has to deal with. The company manufactures castings and pump assemblies for the dredging industry, and operates primarily through its Mobile Pulley unit. The company acquired the then bankrupt Mobile Pulley LLC from Offshore Tool & Energy Corp. for $2.4 million in 2003. Mobile Pulley was a leading producer of large metal cast parts and machined components for the US and international dredging markets, as well as for mining and industrial users. SPI/Mobile Pulley Works has been in operation since 1892.